Fix `udev-device-watcher` target's include directories for libudev

[JafarAbdi]

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I was getting the following error when building in a linux machine

[149/159] Building CXX object CMakeFiles/realsense2.dir/src/linux/udev-device-watcher.cpp.o
FAILED: CMakeFiles/realsense2.dir/src/linux/udev-device-watcher.cpp.o
ccache ccache /ssd/claudiu/hmnd-robot/.pixi/envs/default/bin/c++ -DBUILD_EASYLOGGINGPP -DBUILD_SHARED_LIBS -DCOM_MULTITHREADED -DEASYLOGGINGPP_ASYNC -DELPP_NO_DEFAULT_LOG_FILE -DELPP_THREAD_SAFE -DHWM_OVER_XU -DRS2_USE_V4L2_BACKEND -DUNICODE -DUSING_UDEV -Drealsense2_EXPORTS -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/console_bridge/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/cpp_common/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/rosbag_storage/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/roscpp_serialization/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/rostime/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/roscpp_traits/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/roslz4/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/msgs -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/lz4/lib -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/include -I/ssd/claudiu/hmnd-robot/.pixi/envs/default/include/libusb-1.0 -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/rsutils/include -I/ssd/claudiu/hmnd-robot/build/librealsense2/third-party/json/include -I/include -pedantic -Wno-missing-field-initializers -Wno-switch -Wno-multichar -Wsequence-point -Wformat -Wformat-security -mstrict-align -ftree-vectorize -pthread  -O3 -DNDEBUG -fPIC -MD -MT CMakeFiles/realsense2.dir/src/linux/udev-device-watcher.cpp.o -MF CMakeFiles/realsense2.dir/src/linux/udev-device-watcher.cpp.o.d -o CMakeFiles/realsense2.dir/src/linux/udev-device-watcher.cpp.o -c /ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src/linux/udev-device-watcher.cpp
In file included from /ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src/linux/udev-device-watcher.cpp:4:
/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src/linux/udev-device-watcher.h:11:10: fatal error: libudev.h: No such file or directory
   11 | #include <libudev.h>
      |          ^~~~~~~~~~~
compilation terminated.

[150/159] Building CXX object CMakeFiles/realsense2.dir/src/linux/backend-v4l2.cpp.o
FAILED: CMakeFiles/realsense2.dir/src/linux/backend-v4l2.cpp.o
ccache ccache /ssd/claudiu/hmnd-robot/.pixi/envs/default/bin/c++ -DBUILD_EASYLOGGINGPP -DBUILD_SHARED_LIBS -DCOM_MULTITHREADED -DEASYLOGGINGPP_ASYNC -DELPP_NO_DEFAULT_LOG_FILE -DELPP_THREAD_SAFE -DHWM_OVER_XU -DRS2_USE_V4L2_BACKEND -DUNICODE -DUSING_UDEV -Drealsense2_EXPORTS -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/console_bridge/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/cpp_common/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/rosbag_storage/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/roscpp_serialization/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/rostime/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/roscpp_traits/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/roslz4/include -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/rosbag/msgs -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/realsense-file/lz4/lib -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/include -I/ssd/claudiu/hmnd-robot/.pixi/envs/default/include/libusb-1.0 -I/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/third-party/rsutils/include -I/ssd/claudiu/hmnd-robot/build/librealsense2/third-party/json/include -I/include -pedantic -Wno-missing-field-initializers -Wno-switch -Wno-multichar -Wsequence-point -Wformat -Wformat-security -mstrict-align -ftree-vectorize -pthread  -O3 -DNDEBUG -fPIC -MD -MT CMakeFiles/realsense2.dir/src/linux/backend-v4l2.cpp.o -MF CMakeFiles/realsense2.dir/src/linux/backend-v4l2.cpp.o.d -o CMakeFiles/realsense2.dir/src/linux/backend-v4l2.cpp.o -c /ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src/linux/backend-v4l2.cpp
In file included from /ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src/linux/backend-v4l2.cpp:13:
/ssd/claudiu/hmnd-robot/libraries/third-party/librealsense/src/linux/udev-device-watcher.h:11:10: fatal error: libudev.h: No such file or directory
   11 | #include <libudev.h>
      |          ^~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.

[sysrsbuild]

Can one of the admins verify this patch?

[Nir-Az]

Thanks for the PR. We build in several Linux platforms and never seen this issue. Since no harm on adding it, I can merge it, but anything special in your environment?

[JafarAbdi]

Thanks for the PR. We build in several Linux platforms and never seen this issue. Since no harm on adding it, I can merge it, but anything special in your environment?

Thanks for looking into this. I'm using pixi to build the package, happy to share the manifest file if you want.